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<p class="MsoNormal">Hi Matthew<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Indeed that was one of the problems (at least I hope).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I had it as 1mm, changed it to 0.5mm and got low values. I also inserted a piece of metal under the source to create back scatter, as this is the actual setup as well. I will play around with the settings now to get comparable spectra.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Next question (for you or anyone else).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Up to now my comparison of the spectra was visual.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I can see the spectrum via root, but have not found a way (yet) to export the data as a text file so that I can plot it in excel.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Do I use “<span class="fontstyle01"><span style="font-size:9.0pt">/gate/actor/addActor EnergySpectrumActor”
</span></span><span class="fontstyle01"><span style="font-family:"Calibri",sans-serif">or can I extract from normal root output as well?</span></span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Just point me in the right direction, the trial and error I will do.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Adolf <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> Matthew Strugari <matthew.strugari@dal.ca> <br>
<b>Sent:</b> Tuesday, June 15, 2021 8:27 PM<br>
<b>To:</b> Adolf Nordin <Adolfn@axim.co.za>; gate-users@lists.opengatecollaboration.org<br>
<b>Subject:</b> Re: [Gate-users] Simulated energy spectrum not same as actual energy spectrum<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi Adolf,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Have you adjusted your production thresholds/cuts? It’s likely that you’re missing secondary and tertiary interactions due to the default cut off value of the world (1.0 mm).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards,<o:p></o:p></p>
<p class="MsoNormal">Matthew<o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-size:10.5pt;font-family:-webkit-standard;color:black"> </span><span lang="EN-CA" style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-size:10.5pt;font-family:-webkit-standard;color:black">--</span><span lang="EN-CA" style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-size:10.5pt;font-family:-webkit-standard;color:black">Matthew Strugari<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-size:10.5pt;font-family:-webkit-standard;color:black">PhD Candidate</span><span lang="EN-CA" style="color:black"> at
</span><span style="font-size:10.5pt;font-family:-webkit-standard;color:black">Biomedical Translational Imaging Centre - BIOTIC,<br>
5890 University Ave, Halifax, NS, B3K 6R8</span><span lang="EN-CA"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span lang="EN-CA" style="font-size:12.0pt;color:black">From:
</span></b><span lang="EN-CA" style="font-size:12.0pt;color:black">Gate-users <<a href="mailto:gate-users-bounces@lists.opengatecollaboration.org">gate-users-bounces@lists.opengatecollaboration.org</a>> on behalf of Adolf Nordin <<a href="mailto:Adolfn@axim.co.za">Adolfn@axim.co.za</a>><br>
<b>Date: </b>Tuesday, June 15, 2021 at 10:29<br>
<b>To: </b><a href="mailto:gate-users@lists.opengatecollaboration.org">gate-users@lists.opengatecollaboration.org</a> <<a href="mailto:gate-users@lists.opengatecollaboration.org">gate-users@lists.opengatecollaboration.org</a>><br>
<b>Subject: </b>[Gate-users] Simulated energy spectrum not same as actual energy spectrum<o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:12.0pt;mso-line-height-rule:exactly"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:white">CAUTION:</span></b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:white"> The Sender
of this email is not from within Dalhousie.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-CA" style="color:white">H</span><span lang="EN-CA">i<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">I’ve hit 2 walls, bit want to sort the first.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">I have a simple geometry for a SPECT system:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">SPECTHEAD<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">Lead shielding<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">Al cover under the crystal<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">Crystal<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">Back cover<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">No collimator (doing intrinsic tests).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">Source<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">The simulation runs fine.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">However, when I compare the energy spectrum from the simulation with an actual energy spectrum from the camera, I get very little low energy counts.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">So I cannot say that the simulation is a true reflection of the actual system.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">Is this a known issue, or am I missing something.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">Thanks.<o:p></o:p></span></p>
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